Fastener



FIG. 1 is a front view of a fastener showing our new design, a rear view being a mirror image of the front view;

FIG. 2 is a right view thereof, a left view being a mirror image of the right view;

FIG. 3 is a plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a cross-sectional view thereof taken along line 5-5 in FIG. 1;

FIG. 6 is a cross-sectional view thereof taken along line 6-6 in FIG. 1; and,

FIG. 7 is a cross-sectional view thereof taken along line 7-7 in FIG. 2. 

CLAIM The ornamental design for a fastener, as shown and described. 